These episodes chronicle the origins of Bleach’s protagonist Ichigo Kurosaki, and follow him and his compatriots through Soul Society and into the Bounto Saga. Release dates for remaining catch up episodes to the current simulcast will be made available in the near future.

For those who have been living under a rock, here's what Bleach is all about:

“BLEACH follows the story of Ichigo Kurosaki. For as long as he can remember, Ichigo Kurosaki has been able to see ghosts. But when he meets Rukia, a Soul Reaper who battles evil spirits known as Hollows, he finds his life is changed forever.”

For anyone new to Bleach, avoid the Bount filler arc at all costs (episode 64 - 109). It will ruin your impression of the show forever.

I personally felt it was one of the better fillers. Especially giving some much needed development. Some of the more recent fillers could be tossed aside more easily than the Bount arc.
Specifically:

Spoiler Alert! Click to show or hide

It better details the progression of Ichigo's hollow problem, showing actual progression of it and how it affects him. Without the arc, he deals with it once against Byakuya and then goes straight to almost being completely possessed by the hollow.